Spotted Lanternfly inWashtenaw County, MISPOTTED LANTERNFLY GUIDE
Washtenaw County — anchored by Ann Arbor and Ypsilanti — is under active SLF watch status following 2024 detections. The University of Michigan campus and surrounding research parks generate high volumes of interstate travel and shipments, elevating introduction risk. US-23 and I-94 connect Washtenaw to the Wayne County infestation zone just 30 miles east, while M-52 links the county toward the fruit-growing regions of Livingston and Ingham counties to the north. Michigan's Great Lakes wine country and apple orchards west of Ann Arbor represent high-value crops at risk. The Huron River corridor running through Ann Arbor and Dexter has dense riparian vegetation that could support rapid SLF establishment.
Highest activity zones
SLF Hotspots in Washtenaw County, MI
Ann Arbor
Active zone
Ypsilanti
Active zone
Saline
Active zone
Chelsea
Active zone
Dexter
Active zone
Primary SLF food source
Tree of Heaven in Washtenaw County, MI
Tree of Heaven colonizes railroad rights-of-way throughout Washtenaw County, particularly along the Michigan Central corridor through Ypsilanti and the Ann Arbor Railroad line near Saline. River margins along the Huron River through Dexter and the Saline River valley have Ailanthus populations that provide SLF overwintering sites. Chelsea and Dexter road margins show increasing ToH pressure as MDARD works with local land managers on removal.
Identify Tree of Heaven →Local action resources
What To Do in Washtenaw County, MI
Report a Sighting
Every sighting in Washtenaw County, MI maps the invasion front. Report directly to Michigan Dept of Agriculture & Rural Development (MDARD).
Report Now →Squish on Sight
See a spotted lanternfly? Kill it immediately — it is legal and encouraged in all states. Learn the best kill methods.
Full Fight Guide →Map ToH in Your Block
Tree of Heaven removal cuts off SLF food supply. Add ToH sightings to the community map to guide removal efforts.
View Sighting Map →Statewide resources
Full MI State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full MI guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Washtenaw County, MI. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Washtenaw County, MI.
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